Automatic stopping mechanism for corner-staying machines.



E. L. HAZEL & R. HOL'BECHE. AUTOMATIC STOPPING MECHANISM FOR CORNERSTAYING MACHINES. APPT-YGATION FILED JAN. 15, 1913.

1,084,631 N Patented Jan. 20, 1914.

2 SHEETS-SHEET l.

wbcmi/ N vg m-wawa E. L. HAZEL & R. HOLBEOHE.

AUTOMATIC STOPPING MECHANISM FOR CORNER STAYING MACHINES 1 APPLICATIONFILED JAN. 1s, 191s.

Patented Jan. 20, 1914.

2 SHEETS'SHEET 2.

. To all whom it may concern:

unTEnlsr-Arms ATEN OFFICE.

ERNEST L. HAZEL AND RICHARD HOLBECHE, .OF BIRMINGHAM, ENGLAND, ASSIGNORSTO STOKES 8i SMITH COMPANY, OF SUMMERCDALE, PHILADELPHIA, PENNSYL-VANIA, A CORPORATION OF PENNSYLVANIA.

AuToMATIo s'rorr ne MECHANISM FOR oomvne-sirnYme MACHINES.

Specification of Letters Patent. Patented an 20 1914 Application filedJanuary 15, 1913, Serial No. 742,265.

Be it known that we, ERNEST L. HAZEL and RICHARD HOLBECHE,SL1bjQCtS ofthe King of Great -Britain, residing at Birmingham,

England, have invented new and useful Improvements in Automatic StoppingMech-' vanism for Corner-Staying Machines, of

which the following is .a specification.

Our present invention relates to safety automatic stopping mechanism forcorner stayingmachines of the type designed to attach corner-stays tothe corners of paper or cardboard boxes, and the object of the inventionis to provide means for automatically-stopping the machine in case thehand or a finger of the operator should happen to be in the path ofmovement of the cornerstaying die during its descent toward the anvilwith which the die cooperates.

It is a well known fact that the operation of these corner-stayingmachines, which are now quite generally used by box manufacturers', isattended with frequent accidents to the operatorsoccasioned by theoperator carelessly, or from lack -of experience allowing his or herhand, or a finger thereof, 'to comebetween the die and anvil, during themovement of the die toward the anvil-in the .act of applying the staytot-he corner of a box'and this results in a mashed or maimed Someattempts have been made to obviate this danger in the present-knowntypes of machines, as by providing movable fingergu a-rds that aredesigned to sweep across the face of the anvil in advance of themovement of the die andbrush or move away any obstruction that maybe inthe pathof movement of the die, but these finger-guards, have not beenentirely satisfactory since they do not always accomplish the, objectfor which they are intended.

obstruction of any kind in the pathof move-' ment of said die.

Briefly and generallystated the invention comprises movable memberspositioned to sweep over the diverging faces of the anvil in advanceofand during the descent-of the ,die, and means actuated by said movablemembers and cooperating with the driving mechanism of the machine forautomatically stopping the same before the die reaches the anvil.

The mechanism is so designed that it may be readily applied as anattachment to known types of machines and without altering the designthereof.

In order to enable othe'rsto understand, make and use our saidinvention, we will now proceedt'o describe the same in detail, referencebeing had forthis purpose to the accompanying drawings, wherein:

Figure lis a front elevation of a portion of a corner-staying machinehaving our improvements appliedthereto. Fig. :2 is a side,

elevation of the same, the driving pulley and 7 the numeral1,.designatesthe head portion of a well known type of corner-stayinmachine, said head having parallel gui es 2,

:between which is mounted a vertically reciprocating member 3,"carryinga die 4 at its lower end, which die cooperates with a stat-ionary anvil5 having diverging walls, as

is usual in machines of this type. The member 3 with its die 4 isreciprocatedby means of a shaft 6, on whichis loosely mounted a pulley 7that is driven continuously,.a ballclutch of known construction beinginter posed between-the hub 8 of the pulley and a collar 9, fixed to theshaft 6. The ball-clutch embodies as a part of its construction, a disk10. that normally rotates with the pulley',

said disk having a laterally projecting lug 12 with whichatreadle-operated gag 13 is arranged to cooperate, said gag operatingwhen thetreadle is actuated to move in the path of movement of and beengaged by the lug on the clutch disk in order to shift the position ofthe same and cause the pulley to run. free and stop the rotation of itsshaft, and consequently reciprocation of the die 4 toward its anvil 5.

As the parts just described are of known rotate the latter andreciprocate the die 4,

but as soon as the lug on the clutch disk comes into contact with a gagor other stop thrust inthe path of movement thereof, the

- pulley willimmediately be disengaged from the shaft so 'as to run freethereon which results in instantly stopping the downward movement of thedie before it reaches the anvil, the stopping point of the dierelatively to the anvil depending upon the position of the lug when itengages its stop or gag. The lug 12 and its cooperating gag 13 are sopositioned relative to the shaft '5 that one complete revolution of thepulley with its clutch disk will effect a singlev reciprocation of thedie, or in other words, will move the die .down into contact with itsanvil and bring it back again to the starting position. It will beapparent therefore, if a second gag is interposed in the path ofmovement of the lug 12, at a point slightly beyond the initial startingposition, as indicated in Fig. 4, the machine will be stopped beforethedie reaches its anvil. We have taken advantage of this operation inapplying our improvements to a known typeofcorner staying machine havingthe form of clutch referred'to'.

It will be apparent, however, that our improvements may be applied tomachines having some other type-of clutch or driving I'neans than thatshown, without departingfrom the spirit of the invention, the showinghere made being only by way of example.

We will now proceed to describe our 1111- provements in detail, which asbefore stated are shown as associated with a known type of machineandwhich when broadly stated, embody means operable through theinterposition of an obstruction between the corner-staying die and itsassociated anvil for throwing the die-operating means out of action andstopping the descent of the die; The reference numerals 14, designate apair of movable guards, consisting in the instance shown of curved orarched plates, one such guard located on each side of the path ofmovement of the die 4, and each pivoted at its outer end, as at 15, to abracket 16, attached to the head 1, of the machine and having its innerend arranged to sweep over the adjacent converging face of the anvil 5,during each downward movement of the die 3.

Secured to a bracket 17 projecting outward from the head 1 of themachine is a stud or pin 18, upon' which is loosely mounted foroscillation, a sleeve 19 carrying a pinion 20 at one end, which pinionis in mesh with a rack 21, secured to the outer face of thereciprocating die-carrier 3, the said rack operating to impart anoscillating movement to thesleeve 19, during each reciprocation of thedie carrier 3. Mounted upon the sleeve 19 for'movement therewith andalso for movement independently thereof, is an oscillatory arm 22, thesaid arm during the normal operation of the machine, being caused topartake of the oscillating'movements of the sleeve, by means of a verysensitive friction clutch consisting of a pair of fiber disks 23 and 24one located on each side of the arm 22, and engaging said sidesfrictionally. The disk 23 isforced into fric-' tional contact with oneside of the arm by means of acoiled spring 25,act-ing upon a washer 26,the tension of the spring, and consequently the frictional resistancebetween the parts, bein adjusted as desired by means of a nut 2 threadedupon the sleeve and acting against the spring, said nut when set forproper adjustment of the spring being held against turning movement bymeans of a lock-nut 28, also threadedupon the sleeve 19.

The movable guard-members 14 are each connected to one end of the arm22, by means of the connecting rods 29, so that with each reciprocation.of the die 4, the free ends of the guard-members are caused to sweepback and forth over the diverging walls of the anvil in advance of thedie, this operation resulting by reason of the friction clutchconnection between the lever 22 and sleeve 19, and occurring so long asthere is no obstruction in the path of movement of the saidguard-members, but in case there should be any such obstruct-ionpresent, it will be engaged by one or the other or both of the guardmembers 14, whereupon the arm 22 will be held against movement, thesleeve 19 turning relatively thereto, this action also being permittedby reason of the friction clutch: connection between the sleeve and arm.

Pivotally. connected to the outer end of the arm 22 is a verticallyextending link 30, said link being. pivotally connected at its upper endto a lever 31 pivoted at 32 to a bracket 33 secured to the head 1 of thema chine frame. 3 The lever 31 is connected at its outer end by a link34 to one arm 35 of a bell-crank lever, which bell-crank lever ispivoted at 36 to a bracket 37 also secured to the head of the machineframe. The other arm 38 of the bell-crank lever has a link connection39, with a horizontally sliding gag or looking dog 40, the latterreciprocating freely in a guide 41 secured to the machine frame. Duringnormal operation of the machine the free end of the gag or looking dog40 is reciprocated back and forth into and out of the path of movemention connection between the die carrier 3 and sleeve 19, the frictionclutch connection be: tween the sleeve 19, and arm 22 and the lever andlink connections with the said gag or lockingdog; p

The operation of the machine will be clearly understood from theforegoing description taken in connection with the following briefstatement.

Normally the gag 13 is in engagement with the lug 12 of, the clutch disk10 as shown in Fig. 4, and the pulley 7 then runs free upon the shaft6,the operating parts of the machine being idle. Vhen it isldesired tostart the machine the gag 13, by means of 'a suitable-'treadle mechanismnot shown, is shifted out. of engagement with the lug 12, and thiscauses the clutch disk 10 to bring about a locking engagement betweenthe pulley 7 and its shaftfi, the shaft being then rotated to impartreciprocatory movements to the die 4 to cause the same to moveback andforth toward and from and in contact with its anvil 5 in order that thecorner stays may be applied to the'box corners as said corners areanvil, it being understoo of course, that a strip of stay material isfed over the corners of the box as they are presented to the anvil,During each successive downward 1 engaged thereby.

movement of the die the guards 14 sweep across the corners of the box inadvance of the downward movement of the die, and so long as there is noobstructionof any kind in the path of movement of the guards the freeend oft-he gag 40 will, with each reciprocation of the die, be thrustinto the path of movement of the lug 12, which now rotates with thedrive shaft 6, but will be withdrawn out of said path before the log 12can make contact therewith and the machine willrun continuously in thismanner. If, however, an obstruction of any kind, such for instance as afinger of the operator, should chance to be in the path of move-' inentof either of the guards 14 duringthe descent of the die, suchobstruction will instantly stop further downward movement of the guards,with the gag 40 including the friction clutch connection of the arm '22with its oscillating means, which friction clutch prevents relative"movement between the arm and sleeve, will maintain said gag in the pathof movement of the lug 12, so as to be clutch the pulley 7 from itsdriving connection with the shaft 6 to cause the same to run -tion ofthe lu osit-ioned over the and through their connections- When soengaged the disk 10 will be shifted to disengage,

free from the shaft, whereuponthe machine will be instantly stopped, thedie 4 coming to a st'ate of rest before it reaches its anvil 5, thisbeing dueto the fact that the gag 40 is so positioned relative tothestarting posi- 12 that it will be engaged thereby. provi ed the gaghas not been withdrawn, before the die has made a full stroke downward,

\Vhile we have shown our improvements as applied to a corner stayingmachine, we do not wish to be understood. as limiting ourselves to theapplication of the improvements to this particular type of machine, asobviously with slight modifications, they may be associated with othertypes ofmachines employing a reciprocating die orother member.

hat weclaim is 1. In a corner staying machine, the combination with areciprocating die and a cooperating anvil, clutch controlled drivingmeans for said die, guards adapted to sweep across the face ofsaid anvilduring the re ciprocation of said die in advance of the downwardmovement thereof, means for actuating the clutch to disconnect said diefrom its driving means, and connections between said guards and theclutch actuator for rendering the latter inoperative when the guardspass across the anvil.

2. In a corner staying machine, the com-v bination with a reciprocatingdie, and a cooperating anvil, clutch controlled driving.

means for 'said die, guards adapted to sweep across the face of saidanvil during the reciprocation of said die in advance of the downwardmovement thereof, means operated by, the movement of the die forimparting motion to said guards, a frictional slip connection forming apart of said means, means for actuating the clutch to disconnect saiddie from its driving means, and

connections between said frictional slip con- 110 nection'and the clutchactuator for'rendering the'l'atterinoperativewhen the guards are passedacross the anvil, ,and holding said actuator in operative position whenthe guards encounter an obstruction.-

3. In acorner-staying machine, the combination with a' reciprocating dieand c0- operating -'anv1'l having diverging faces, of

meansf for imparting a reciprocatirz movement to" the die, movablemembei actuated by the die for sweeping across safdldiverging faces ofthe anvil, and means actuated throughthe interposition of an obstructionin the path ofmoiieni'ent of saidmovable members, or either of them, forthrowing said die moving means out of act ion.

4. In acorner-staying machine, the combination with a reciprocating dieand cooperating anvll, o adrlving shaft for im-,

parting reciprocatory movements to the'die, clutch-controller] drivingmeans for a shafta movable guard .pivotally mounted to" means out ofoperation to stop the machine.

5. The combination with a reciprocating die and cooperating anvil, of a'driving shaft for imparting reciprocatory movements to the die,clutch-controlled driving means for the shaft, a gag cooperativelyassociated with said clutch-controlled driving means for throwing thelatter out of operation, movable'guards adapted to sweep over. the facesof the anvil during the reciprocating movements of the die, andconnections'between said" movable guards andsaid gag for operating thelatter, said connections in cluding a frictionals'lip connection.

6. In a corner staying machine, the combination with areciprocating dieand a cooperating anvil having diverging faces, of means for impartingreciprocatory' move ments to the die, a pair of pivoted guardspositioned to sweep back and forth over the said diverging faces of theanvil, means operated by the reciprocatory movements of the die forimparting the said back and forth movements to said guards, and meansactuated by the guards when either or both encounter an. obstruction forStopping the operation of the machine. i

7. In a corner staying machine, the combination with a reciprocating diecarrier carrying a die and a cooperating anvil, of.

a drive shaft for imparting reciprocatory movements to the die carrierand its die, a pulley freely mounted o n the drive shaft, :1 clutch-diskfor locking the pulley to the shaft, a gag cooperatively associated withsaid clutch-disk, a guard movable back and forth across the face of theanvil in advance of the die, and means operated by the die carrier forpositively actuating the movable guard in both directions, and forreciprocating the said gag, said means including a frictional slipconnection.

8. The combination with a reciprocating die, of a driving shaft forimparting reciprocatory movements to the die, clutch- .controlleddriving means for the shaft, a

gag cooperatively associated with said clutch-controlled driving meansfor throwing the latter out of operation, means mount,-

ed on the die and operating during the reciprocating movements thereoffor actuating the gag, a guard movable in advance of the die and movedpositively by said means on the" die, and connections between vwitnesses.

the guard and gag for operating the latter through the interpositionofan obstruction in the pathof movement of the guard, said connectionsincludmg a frictional slip connection.

9. In a corner staying machine the combination with a reciprocatingdie-carrier carrying a die, clutch-controlled driving means for thedie-carrier, a pair of pivoted guards positioned for movement in advanceof the die, an oscillating arm pivoted on a fixed support, meansactuated by the die-carrier for oscillating the arm, a frictional slipconnection between the arm and its actuating means, a gag cooperativelyassociated with the said clutch-controlled driving means, andconnectionsbetweensaid gag and oscillating arm.

10. In a corner staying machine, the combination with adie-carrier andits die, a driving shaft for imparting reciprocatory movements to thedie-carrier and its die,

clutch-controlled driving means for the shaft, pivotally mounted guardspositioned for movement in advance of the die, an oscillating arm havingindependent connections with said said means including a frictionalconnection, a gag cooperatively associated with the clutch-controlleddriving means, and operative connections between said gag andoscillating arm. i

11, In a corner-staying machine the com-' bination with a reciprocatingdie-carrier and its die, of a shaft for imparting reciprocatorymovements to the die,-carrier,clutchcontrolled driving means for theshaft, a pair of pivoted guards positioned for movement in advance ofthe die, a fixed stud, a sleeve free to oscillate on said stud, a rackand pinion connection between the die'ca-rrier and sleeve for. rotatingthe latter, an

' arm 'frictionally supported upon the sleeve,

connections between the guards and one end of the arm, a gagcooperatively associated with the clutch-controlled driving means, andoperative connections between said gag and the other end of the saidarm.

In testimony whereof we have hereuntoset our hands in presence of twosubscribing Witnesses:

C. E. SGHAEFFER, J. L. Connoe.

RICHARD HOLBECHE. Witnesses:

ROBERT LEAF, KATHLEEN W. THoMPsoN.-

ERNEST L. HDAZEL.

' ards, means operated by the die-carrier for oscillating the arm,

